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10.359.314 Patented Mar. 15, 1887.

N. PETERS. Pnuwlhognphnr. wnshingmn, Dl C.

UNITED STATES PATENT OFFICE.

THOMAS BURKHARD, OF BROOKLYN, NEW YORK.

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SPECIFICATION forming pari-.of Letters Patent No. 359,314, dated March 15,1887.

' Application led November 5, 1886. Serial No. 218.038. (No model.)

To aZZ whom it may concern.:

Be it known that I, THOMAS BURKHARD, of

Brooklyn, in the county of Kings and State v stove.

The object of my present invention is to prevent radiation of heat downward through the openings in the cast-metal skeleton base, and consequent liability of fire when the sheetmetal bottom becomes red-hot by dumping hot coals upon it.

The invention will be hereinafter fully described, and pointed ont in the claims.

In the accompanying drawings, Figure l is avertical section of a stove embodying my invention. Fig. 2 is an inverted plan of the stove. Fig. 3 is a vertical section of a portion of the bottom, showing the shield or plate of sheet metal las placedy between theasbestus or vother non-conducting material and the skeleton cast-metal base; and Fig. 4 is a section similar to Fig. 3, showing the layer of nonconducting material as faced on both sides with sheet metal and secured between the sheet-metal stove-bottom and the base.

Similar letters of reference designate corresponding parts in all the figures.

A designates the side wall of the stovebod y, which is usually of sheet metal, and above the ring B, which supports the grate B', is lined with fire-brick A. The top 0f the stove C may be formed of a number of concentric rings, so as to afford an opening for a large or small kettle. The stove is represented as having a fire-door, C', for the introduction of fuel, an ash-pit door, O2, and an escape-pipe, C3, for the products of combustion, and the bottom of the stove D is of sheetiron or other sheet metal, which may be secured to the cylindric bodyA by a folded joint or seam',as shown at d, or in any other suitable way.

In so far as described the stove is of ordinary construction, and does not embody my invention.

In the present example of the invention the stove has secured to its sheet-metal bottom D a cast-metal skeleton base, E, which may be provided with feet or legs e, on which the stove is supported, and which maybe secured to the sheet-metal bottom D by rivets d', or other suitable securing devices. In order to secure lightness, the cast-metal base E is of skeleton construction, and, as here shown, Vcomprises concentric rings e e2 and cross-bars e3.

F designates a sheet or layer of asbestus or othersuitable non-conducting material,which is applied and secured to the under side of the sheet-metal bottom D, and when the stove comprises a cast-metal base, E, as described, this layer F of non-conducting material will be interposed between the base and the sheetmetal bottom D, and will be secured in place by the same rivets or other devices which connect the sheet-metal bottom and the cast-metal base. This layer F of non-conducting material may be of any suitable thickness to prevent downward radiation from the bottom D sufficient to burn the floor, even though the door' may be unprotected and the bottom heated to a red heat.

In carrying out my invention it is desirable to cover the non-conducting material upon the under side, in'order toprevent abrasion and disintegration thereof. I have, therefore, in Fig. 3 shown the non-conducting material as having upon the under side a facing, f, which consists of a thin plate of sheet metal constituting a shield or guard to protect the nonconducting material. Vhen this shield or guard f is employed as a facing for the nonconducting material F, the non-conducting material will not be exposed to View upon the under side of the stove, as is the ease with the construction shown in Figs. l and 2.

In Fig. 4 I have represented the layer of non-conducting material, F, as having a facing of metal, f, upon both sides thereof, and the layer F, having the metal facingsf upon both its upper and lower sides,is interposed between the sheet-metal bottom D and the cast-metal skeleton base E.

lVIy invention adds but very little to the cost of confectioners stoves, and is of great advantage, because it will do much toward lessening the IOO number of fires which occur in establishments where these stoves are used.

I am aware that it is not new to make ,the

walls and bottoms of stoves and ovens of two thicknesses of sheet metal, each continuous and imperforate, and having between them a nonconducting lling, and I do not claim, broadly, such construction as of my invention. In my construction the cast-metal base must be ot' considerable thickness to give it necessary strength, and it is made of open or skeleton form to reduce its weight. If the sheet-metal bottom were exposed on the under side through the openings in the skeleton base and in close proximity to the ioor, the door might be ignited when hot coals are dumped upon the sheet-metal bottom. 'Even if the base were imperforate, it might get red hot if a body of heated coals were dumped upon the bottom.

By the employment of nonconducting material F between the sheet-metal bottom and skeleton base I secure advantages which have never been possessed by the stoves heretofore in use. I am able to use a cast-metal base of open or skeleton form, which is desirable because of its lightness, and without having the sheet-metal bottom, which may become redhot, exposed on the under side through the openings in the base, and by the use of the shield f, I protect the asbestns or other noneonducting material from exposure and disintegration without the disadvantage of making the cast-metal base continuous or imperforate to secure such result.

W'hat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, in a stove-body, of a sheet-metal bottom, D, a cast-metal skeleton base,E, secured to the under side of saidbottom, and serving to prevent its bulging and cracking by expansion and contraction, and a layer Of non-conducting material, F, interposed and retained in place between the sheetmetal bottom and the cast-metal base, substantially as herein described.

2. The combination, ina stove-body, of the sheetmetal bottom D, a cast-metal skeleton base, E, secured to the under side of the bottom, and serving to prevent its bulging and cracking by expansion and contraction, and a layer of non-conducting material,F, faced upon the under side with a sheetmetai shield, f, interposed and securedbetween the sh eet-m etal bottom and the cast-metal skeleton base, substantially as herein described.

THOMAS BURKHARD.

IVitnesses:

FREDK. HAYNEs, EMIL Hmrrna. 

